How to implement the Fn trait in core::ops?
I have read the documents on doc.rust-lang.org but it doesn't show how to use Fn trait by implementing the trait.
You can do so, but only on nightly using unstable features.
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Thank you very much! 
By the way, can I use your code on my blog? If you agree, how should I sign your name?
Feel free. "QuineDot" is fine (or no attribution is also fine in this case).
no problem. Thanks again! 
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